What is silicone overmolding?

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What is Silicone Overmolding?

Silicone overmolding is a process in which silicone rubber is molding with a “metal or plastic part” into mold cavity and then heated to cure, then have the final product which have protective and soft layer. It allowing products to combine the best of two different materials that soft silicone material & hard plastic or metal material.

Note: The silicone overmolding is applying with Solid Silicone Rubber material.

What is Silicone Injection Overmolding?

Silicone injection overmolding is a process that is used to produce a high-quality and durable product. 

The process of silicone injection overmolding is: place metal or plastic part into the mold, then inject liquid silicone rubber “LSR” into the mold cavity to cover the core part then cure to form a final product. This allows for complex shapes to be created without any need for any additional assembly and reduces the number of parts in an assembly from two to one, and the silicone injection overmolding is not much different from plastic overmolding except for the raw material feeding system is different.

Note: silicone injection overmolding is apply with liquid silicone rubber and the core part can be metal or “high temperature-resistant” plastic, such as Nylon, PEEK.

What is difference between silicone overmold and silicone injection overmolding

Most of peopel don’t know there are two different technique of silicone overmold & silicone injection overmolding, let’s see what’s diffference with details:

Q: Raw material difference

Silicone overmolding: solid silicone rubber

Silicone injection overmolding: liquid silicone rubber (LSR)

Q: Molding machinery difference

Silicone overmolding: solid silicone rubber molding machine

solid silicone molding machine

Silicone injection overmolding: liquid silicone rubber (LSR) injection molding machine

horizontal silicone injection molding machine

Q: Cost difference

Silicone overmolding: middle cost due to cheaper raw material cost “solid silicone rubber” and cheaper molding machinery & tooling cost, and less time of molding production.

Silicone injection overmolding: high cost due to expensive raw material cost “liquid silicone rubber” and expensive molding machinery & tooling cost, and longer time of molding production.

Q: Quality difference

Silicone overmolding products are soft as liquid silicone injection molding products, but not less elasticity and less transparency, and more flash, the whole product is lower quality.